[PATCH] vdpa: Set speed and duplex of mlx5_vnet to UNKNOWN

[Carlos Bilbao <carlos.bilbao.osdev@gmail.com>]

From: Carlos Bilbao <cbilbao@digitalocean.com>

mlx5_vdpa vDPA devices currently don't support reporting or setting the
speed and duplex and hence should be UNKNOWN instead of zero.

Signed-off-by: Carlos Bilbao <cbilbao@digitalocean.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c |  7 +++++++
 drivers/vdpa/vdpa.c               | 23 +++++++++++++++++++++++
 include/uapi/linux/vdpa.h         |  2 ++
 3 files changed, 32 insertions(+)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index fa78e8288ebb..319f5c6121de 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -3795,6 +3795,13 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 	init_rwsem(&ndev->reslock);
 	config = &ndev->config;
 
+	/*
+	 * mlx5_vdpa vDPA devices currently don't support reporting or
+	 * setting the speed or duplex.
+	 */
+	config->speed  = SPEED_UNKNOWN;
+	config->duplex = DUPLEX_UNKNOWN;
+
 	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU)) {
 		err = config_func_mtu(mdev, add_config->net.mtu);
 		if (err)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 4dbd2e55a288..abde23e0041d 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -15,6 +15,7 @@
 #include <net/genetlink.h>
 #include <linux/mod_devicetable.h>
 #include <linux/virtio_ids.h>
+#include <uapi/linux/ethtool.h>
 
 static LIST_HEAD(mdev_head);
 /* A global mutex that protects vdpa management device and device level operations. */
@@ -919,6 +920,22 @@ static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
 	return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
 }
 
+static int vdpa_dev_net_speed_config_fill(struct sk_buff *msg, u64 features,
+					struct virtio_net_config *config)
+{
+	__le32 speed = cpu_to_le32(SPEED_UNKNOWN);
+
+	return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_SPEED, sizeof(speed), &speed);
+}
+
+static int vdpa_dev_net_duplex_config_fill(struct sk_buff *msg, u64 features,
+					struct virtio_net_config *config)
+{
+	u8 duplex = DUPLEX_UNKNOWN;
+
+	return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_DUPLEX, sizeof(duplex), &duplex);
+}
+
 static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
 {
 	struct virtio_net_config config = {};
@@ -941,6 +958,12 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
 	if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
 		return -EMSGSIZE;
 
+	if (vdpa_dev_net_speed_config_fill(msg, features_device, &config))
+		return -EMSGSIZE;
+
+	if (vdpa_dev_net_duplex_config_fill(msg, features_device, &config))
+		return -EMSGSIZE;
+
 	return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
 }
 
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 842bf1201ac4..1c64ee0dd7b1 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -43,6 +43,8 @@ enum vdpa_attr {
 	VDPA_ATTR_DEV_NET_STATUS,		/* u8 */
 	VDPA_ATTR_DEV_NET_CFG_MAX_VQP,		/* u16 */
 	VDPA_ATTR_DEV_NET_CFG_MTU,		/* u16 */
+	VDPA_ATTR_DEV_NET_CFG_SPEED,		/* u32 */
+	VDPA_ATTR_DEV_NET_CFG_DUPLEX,		/* u8 */
 
 	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
 	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,		/* u32 */
-- 
2.34.1